SOMA

WARNING: QCFLAG EXISTS. PLEASE READ THE DOCUMENTATION.

Station Information

Station ID: 1345
Latitude: 37.83055556
Longitude: 140.96166667
Coastline code: 642
Station code: 36
Country: JAPAN
Time span of RLR data: 1973 – 2021
RLR completeness (%): 87
Time span of metric data: 1973 – 2021
Metric completeness (%): 96
Link to ellipsoid: Available
Date of last update: 05 Apr 2022

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR Station
Red Marker: Neighbouring Metric Station

Please note: In many cases, the station position in our database is accurate to only one minute. Thus, the tide gauge may not appear to be on the coast.

Additional Data Sources (guide to additional data sources)

Nearby GNSS Stations from SONEL: P125, P106

Station Documentation

Link to RLR information.

Documentation added 1991-06-11

Soma 642/036 RLR(1974) is 11.0m below BM Attach-27

Documentation added 2009-11-17

The relevant authority for this station is the Geographical Survey Institute. For some reason the data for 1998 was not downloaded from this authority. Data downloaded and entered 17.11.09.

Documentation added 2012-02-22

A massive earthquake of magnitude 9.0 occurred at 14.46 JST (05.46 UTC) on Friday 11th March 2011 with the epicentre situated approx. 70km east of the Oshika Peninsula of Tohoku. It was the largest earthquake to strike Japan and triggered a tsunami with waves of up to 40.5m and travelling inland up to 10km.

Documentation added 2014-03-13

The GPS benchmark information has been downloaded from the SONEL website. GPS benchmark P106 is 14.116m above RLR.

Documentation added 2022-04-05

Following review of data affected by the Tōhoku earthquake of 2011, all data has been flagged as good as GSI have recommenced levelling at the site. The station flag has been set to indicate the record needs to be treated with care, but the data appears to accurately reflect the earthquake's ongoing effect on local relative sea level.

Documentation added 2022-04-26

Documentation from the GSI confirms this installation was destroyed in the tsunami following the Tōhoku earthquake in March 2011. A temporary gauge was set up in June 2011, and a new permanent installation began operating in September 2015. Data from the temporary site have not been connected to the primary benchmark through levelling, so this period is not included in the RLR dataset.

Data Authority

Geographical Survey Institute
Kitasato -1
Tsukuba-shi
Ibaraki-ken 305